FYI the DMA 20 s2 is clearly better than the series 1. I was able to compare both some time ago when I owned the series 2. If you like the Spectral sound and want phono the DMA 20 is a great preamp. I can't comment on," is the 20 better than the 30sl because it has been too long since I owned the DMA20." I now own
the 30sl with generation 2 SHAA modules. ( I had my preamp updated )They are better than genaration 1 and worth the cost IMHO.
Better bass, dynamics in particular, Any personal questions feel free to e-mail me at drjoe@hotmail.com.
Hope this helps, Joe